U.S. airlines and foreign airlines serving the U.S. carried an all-time high of 1.0 billion systemwide (domestic and international) scheduled service passengers in 2018, 4.8 percent more than the previous record high of 965.4 million reached in 2017. The year-over-year systemwide increase resulted from a 4.9 percent rise in the number of passengers on domestic flights (777.9 million passengers in 2018) and 4.4 percent growth in passengers on U.S. and foreign airlines’ flights to and from the U.S. (233.6 million passengers in 2018) (Tables 1, 1A, 5, 9). Systemwide passengers include those on scheduled domestic flights plus those on scheduled flights to and from the United States.